So stay away from the dongles?
The dongle Is fine there are many out there I just like the Noo stuff because its compatable with Software you will see lots on ebay and there
all got thier CCR Issues.
I think just sticking it into you laptop USB port and letting it hang there is a bad idea because it stresses out the plug and you are next to
a noise generator (PC) so I run an USB extention and have the SDR out at the HF antenna feed Point.
I find the SDR dongle direct to the HF antenna to have many issues because it lacks decent filtering to I run the HF up converter.
You taking HF and putting it 125 Mhz Up in Frequency where the SDR is pretty efficient and running there - the Upconverter has some good
feed point filtering but i run a AM broadcast band Trap to kill the local 1340 and 1420 KHz AM sites near me. You can run An Fm
Trap if the local Music station get into everything like on the Airband.
You just ad 125 Mhz to the SDR software at the option Section and this software does its job.
This is a HPF and not a notch, so it does not pass VLF/LF either. This is an RX only filter. Pass band is from about 2.5 MHz and above. Insertion loss is less than 2 dB, and mostly less than 0.3 dB between 5 – 30 MHz.
www.ebay.com
Also known as “FM Trap”. Notes: RX filter only. Designed for SDR users, but might also be useful for TV users struggling with FM interference. e.g. Channels between 76 - 88 MHz could be attenuated enough to lose reception.
www.ebay.com
Read around There is a learning Curve its not going to run out of the Bubble pack and do majic stuff you need to make it work for you.
Pete N1EXA